EP 0802438 A3 19981216 - Shape control apparatus for reflecting mirrors
Title (en)
Shape control apparatus for reflecting mirrors
Title (de)
Vorrichtung zur Kontrolle der Form von reflektierenden Spiegeln
Title (fr)
Appareil de contrÔle de la forme pour miroirs réflecteurs
Publication
Application
Priority
JP 9677896 A 19960418
Abstract (en)
[origin: EP0802438A2] The control of a mirror's shape, such as for use in large reflecting telescopes, is associated with discrete points so as to avoid incurring constraints and exerting undesirable stress on the reflecting mirror through control unrelated to the mechanical characteristics. Thus, a reflecting mirror (1) is approximated by a non-constrained circular plate having a similar mechanical structure, and an eigenfunction value arithmetic unit (9) calculates values of Bessel-Fourier functions which are eigenfunctions of free vibrations of the circular plate. Using these function values, a mode displacement identification unit (10) approximates a required mirror displacement (12), which is necessary to correct for wavefront distortion, with a linear combination up to a prescribed mode of vibration of the eigenfunction. A support mechanism command unit (11) controls an actuator (6) so that the value of the linear combination function equals the amount of mirror displacement at a position supported by a reflecting mirror support mechanism (2). <IMAGE>
IPC 1-7
IPC 8 full level
G02B 23/02 (2006.01); G01J 9/00 (2006.01); G02B 5/10 (2006.01); G02B 7/18 (2006.01); G02B 7/198 (2006.01); G02B 26/06 (2006.01)
CPC (source: EP US)
G01J 9/00 (2013.01 - EP US); G02B 26/06 (2013.01 - EP US)
Citation (search report)
- [A] US 4091274 A 19780523 - ANGELBECK ALBERT WOLCOTT, et al
- [A] US 5477393 A 19951219 - SASAKI AKI [JP], et al
- [A] US 4467186 A 19840821 - GORALNICK NORMAN S [US], et al
- [A] US 4875764 A 19891024 - MARINO PHILIP F [US], et al
- [A] RODDIER F: "CURVATURE SENSING AND COMPENSATION: A NEW CONCEPT IN ADAPTIVE OPTICS", APPLIED OPTICS, vol. 27, no. 7, 1 April 1988 (1988-04-01), pages 1223 - 1225, XP000197227
- [DA] PATENT ABSTRACTS OF JAPAN vol. 017, no. 255 (P - 1539) 20 May 1993 (1993-05-20)
- [A] PATENT ABSTRACTS OF JAPAN vol. 016, no. 200 (E - 1201) 13 May 1992 (1992-05-13)
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0802438 A2 19971022; EP 0802438 A3 19981216; JP 3234152 B2 20011204; JP H09281315 A 19971031; US 5798878 A 19980825
DOCDB simple family (application)
EP 96118380 A 19961115; JP 9677896 A 19960418; US 74749296 A 19961112